Home Networking Set up Multiple Network Locations on Your Mac.
Does this old router have any use? Is there any reason to have two routers on the same home network? In this article, we detail the reasons two routers may improve your home network and provide some tips on making sure your two routers play nice.
You must disable the DHCP server as you do not want the router to do routing functions, that's what the hub continues to do. Turn off NAT and firewall on router if there are settings for these. Finally, connect the router to the hub by an Ethernet cable using any of the LAN ports.
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Setting up your network securely takes only a few steps, but the router you have will determine how easy the process is.Use the strongest security settings: While youre changing the administrator and Wi-Fi passwords, its good to check which security standard your router is using.
(Each router will have a unique ssid so that's not a problem, as I'll rename the new router to the ssid already in place). So to sum up, Would it be better to disable all security on the 2nd router, and run it off the first, using the primary router's security settings for internet traffic?

When you set up multiple routers on a network, designate the router that connects to the Internet as the gateway and the other routers as routers. Configure the gateway with a WAN and LAN address, firewall and DHCP server.
Setting up your primary router is key for a strong network at home. Youll need some items like an Ethernet cable, a computer, and good internet. This guide will help you start and fine-tune your primary router setup.
Settings for RouterA. Can be set DHCP. Also, take note of IP address of this device, as well as Subnet Mask. (there may be Internet IP Address (WAN) and Local (LAN) IP address--you want the LAN--the WAN won't matter for this).